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class="smallimg"><div><p class="pic"><img src="https://tyunfile.71360.com/UploadFile/dgrydzkj/637366419704238281/7983258.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="k89gkte" class="content"><p><span>需求數(shù)量：</span>0</p><p><span>價(jià)格要求：</span>面議</p><p><span>所在地：</span>廣東省</p><p><span>包裝要求：</span><span style="color: #f30;"></span></p><p><span>產(chǎn)品關(guān)鍵詞：</span>河南安防PCB設(shè)計(jì)制板,PCB設(shè)計(jì)</p><p><span>***更新：</span>2021-01-29 03:16:03</p><p><span id="click" >瀏覽次數(shù)：0次</span></p><a rel="nofollow" class="button">聯(lián)系我們</a></div></div><div id="7xbsm8i" class="rightbox"><h3>公司基本資料信息</h3><p style="border:0;"><a rel="nofollow">東莞市仁遠(yuǎn)電子科技有限公司</a></p><p><span>聯(lián)系人：</span>陳海濤</p><p><span>郵箱: </span>haitao_chen@dgrenyuan.com</p><p><span>電話: </span>13802373717</p><p><span>傳真: </span>0769_</p><p><span>網(wǎng)址: </span>http://www.dgrenyuan.com</p><p><span>手機(jī): </span>0769-85626128</p><p><span>地址: </span>長(zhǎng)安鎮(zhèn)烏沙社區(qū)環(huán)東路228號(hào)企匯服務(wù)中心五樓501</p><p>[當(dāng)前離線] <a rel="nofollow"> [加為商友] </a><a rel="nofollow"> [發(fā)送信件] </a></p></div></div><div id="sjlczdk" class="page-proshow02"><p class="title">詳細(xì)說(shuō)明</p><div id="kzrtf7h" class="box"><p><p> 主要的信號(hào)完整性問(wèn)題包括：延遲、反射、同步切換噪聲、振蕩、地彈、串?dāng)_等。信號(hào)完整性是指信號(hào)在電路中能以正確的時(shí)序和電壓做出響應(yīng)的能力，是信號(hào)未受到損傷的一種狀態(tài)，它表示信號(hào)在信號(hào)線上的質(zhì)量。延遲(Delay)延遲是指信號(hào)在PCB板的導(dǎo)線上以有限的速度傳輸，信號(hào)從發(fā)送端發(fā)出到達(dá)接收端，其間存在一個(gè)傳輸延遲。信號(hào)的延遲會(huì)對(duì)系統(tǒng)的時(shí)序產(chǎn)生影響，傳輸延遲主要取決于導(dǎo)線的長(zhǎng)度和導(dǎo)線周圍介質(zhì)的介電常數(shù)。在高速數(shù)字系統(tǒng)中，信號(hào)傳輸線長(zhǎng)度是影響時(shí)鐘脈沖相位差的較直接因素，時(shí)鐘脈沖相位差是指同時(shí)產(chǎn)生的兩個(gè)時(shí)鐘信號(hào)，河南安防PCB設(shè)計(jì)制板，到達(dá)接收端的時(shí)間不同步。時(shí)鐘脈沖相位差降低了信號(hào)沿到達(dá)的可預(yù)測(cè)性，如果時(shí)鐘脈沖相位差太大，河南安防PCB設(shè)計(jì)制板，會(huì)在接收端產(chǎn)生錯(cuò)誤的信號(hào)，如圖1所示，傳輸線時(shí)延已經(jīng)成為時(shí)鐘脈沖周期中的重要部分。反射(Reflection)反射就是子傳輸線上的回波。當(dāng)信號(hào)延遲時(shí)間(Delay)遠(yuǎn)大于信號(hào)跳變時(shí)間(TransitionTime)時(shí)，信號(hào)線必須當(dāng)作傳輸線。當(dāng)傳輸線的特性阻抗與負(fù)載阻抗不匹配時(shí)，信號(hào)功率(電壓或電流)的一部分傳輸?shù)骄€上并到達(dá)負(fù)載處，但是有一部分被反射了。若負(fù)載阻抗小于原阻抗，反射為負(fù)；反之，河南安防PCB設(shè)計(jì)制板，反射為正。 </p> <p> <br /> </p> <p> <span style="display:none;"></span> 您在找PCB設(shè)計(jì)和線路板供應(yīng)服務(wù)商的同時(shí)，我們也在找您！來(lái)仁遠(yuǎn)電子，價(jià)格有優(yōu)惠哦！河南安防PCB設(shè)計(jì)制板</p> <span style="display:none;"></span><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="河南安防PCB設(shè)計(jì)制板,PCB設(shè)計(jì)" src="https://tyunfile.71360.com/UploadFile/dgrydzkj/637366419704238281/7983258.png"></div><p>而是板級(jí)設(shè)計(jì)中多種因素共同引起的，主要的信號(hào)完整性問(wèn)題包括反射、振鈴、地彈、串?dāng)_等，下面主要介紹串?dāng)_和反射的解決方法。串?dāng)_分析：串?dāng)_是指當(dāng)信號(hào)在傳輸線上傳播時(shí)，因電磁耦合對(duì)相鄰的傳輸線產(chǎn)生不期望的電壓噪聲干擾。過(guò)大的串?dāng)_可能引起電路的誤觸發(fā)，導(dǎo)致系統(tǒng)無(wú)法正常工作。由于串?dāng)_大小與線間距成反比，與線平行長(zhǎng)度成正比。串?dāng)_隨電路負(fù)載的變化而變化，對(duì)于相同拓?fù)浣Y(jié)構(gòu)和布線情況，負(fù)載越大，串?dāng)_越大。串?dāng)_與信號(hào)頻率成正比，在數(shù)字電路中，信號(hào)的邊沿變化對(duì)串?dāng)_的影響比較大，邊沿變化越快，串?dāng)_越大。針對(duì)以上這些串?dāng)_的特性，可以歸納為以下幾種減小串?dāng)_的方法：(1)在可能的情況下降低信號(hào)沿的變換速率。通過(guò)在器件選型的時(shí)候，在滿足設(shè)計(jì)規(guī)范的同時(shí)應(yīng)盡量選擇慢速的器件，并且避免不同種類的信號(hào)混合使用，因?yàn)榭焖僮儞Q的信號(hào)對(duì)慢變換的信號(hào)有潛在的串?dāng)_危險(xiǎn)。(2)容性耦合和感性耦合產(chǎn)生的串?dāng)_隨受干擾線路負(fù)載阻抗的增大而增大，所以減小負(fù)載可以減小耦合干擾的影響。(3)在布線條件許可的情況下，盡量減小相鄰傳輸線間的平行長(zhǎng)度或者增大可能發(fā)生容性耦合導(dǎo)線之間的距離，如采用3W原則。河南安防PCB設(shè)計(jì)制板專業(yè)pcb設(shè)計(jì)版圖，加工生產(chǎn)各種線路板，電路板抄板質(zhì)量這么好，你確定不來(lái)看看？</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="河南安防PCB設(shè)計(jì)制板,PCB設(shè)計(jì)" src="https://tyunfile.71360.com/UploadFile/dgrydzkj/637366420229423828/5674939.png"></div><p>高頻電路通常處理速度較高，布線密度大，選用實(shí)木多層板既是布線所務(wù)必，也是降低干擾的合理方式。在PCBLayout環(huán)節(jié)，有效的挑選一定疊加層數(shù)的印制電路板規(guī)格，能靈活運(yùn)用內(nèi)層來(lái)設(shè)定屏蔽掉，能夠更好地完成就近原則接地裝置，并合理地減少內(nèi)寄生電感器和減少信號(hào)的傳送長(zhǎng)短，另外還能大幅地減少信號(hào)的交叉式影響等，全部這種方式都對(duì)高頻電路的可信性有益。相同原材料時(shí)，四層板要比雙面板的噪音低20dB?？墒?，另外也存有一個(gè)難題，PCB半疊加層數(shù)越高，生產(chǎn)制造加工工藝越繁雜，產(chǎn)品成本也就越高，這就規(guī)定在開(kāi)展PCBLayout時(shí)，除開(kāi)挑選適合的疊加層數(shù)的PCB板，還必須開(kāi)展有效的電子器件合理布局整體規(guī)劃，并選用恰當(dāng)?shù)牟季€標(biāo)準(zhǔn)來(lái)進(jìn)行設(shè)計(jì)方案。1、高頻電路元器件引腳間的導(dǎo)線固層更替越低就越好說(shuō)白了“導(dǎo)線的固層更替越低就越好”就是指元器件聯(lián)接全過(guò)程中常用的焊盤(pán)（Via）越低就越好。一個(gè)焊盤(pán)可產(chǎn)生約，降低過(guò)孔眼能顯著提高速度和降低數(shù)據(jù)信息錯(cuò)誤的概率。2、高頻電路元器件引腳間的導(dǎo)線越少越好信號(hào)的輻照度是和信號(hào)線的走線長(zhǎng)短正相關(guān)的，高頻率的信號(hào)導(dǎo)線越長(zhǎng)，它就越非常容易藕合到挨近它的電子器件上來(lái)。</p><p> 布線的幾何形狀、不正確的線端接、經(jīng)過(guò)連接器的傳輸及電源平面不連續(xù)等因素的變化均會(huì)導(dǎo)致此類反射。同步切換噪聲(SSN)當(dāng)PCB板上的眾多數(shù)字信號(hào)同步進(jìn)行切換時(shí)(如CPU的數(shù)據(jù)總線、地址總線等)，由于電源線和地線上存在阻抗，會(huì)產(chǎn)生同步切換噪聲，在地線上還會(huì)出現(xiàn)地平面反彈噪聲(地彈)。SSN和地彈的強(qiáng)度也取決于集成電路的I/O特性、PCB板電源層和平面層的阻抗以及高速器件在PCB板上的布局和布線方式。串?dāng)_(Crosstalk)串?dāng)_是兩條信號(hào)線之間的耦合，信號(hào)線之間的互感和互容引起線上的噪聲。容性耦合引發(fā)耦合電流，而感性耦合引發(fā)耦合電壓。串?dāng)_噪聲源于信號(hào)線之間、信號(hào)系統(tǒng)和電源分布系統(tǒng)之間、過(guò)孔之間的電磁耦合。串繞有可能引起假時(shí)鐘，間歇性數(shù)據(jù)錯(cuò)誤等，對(duì)鄰近信號(hào)的傳輸質(zhì)量造成影響。實(shí)際上，我們并不需要完全消除串繞，只要將其控制在系統(tǒng)所能承受的范圍之內(nèi)就達(dá)到目的。PCB板層的參數(shù)、信號(hào)線間距、驅(qū)動(dòng)端和接收端的電氣特性、基線端接方式對(duì)串?dāng)_都有一定的影響。過(guò)沖(Overshoot)和下沖(Undershoot)過(guò)沖就是前列個(gè)峰值或谷值超過(guò)設(shè)定電壓，對(duì)于上升沿，是指比較高電壓，對(duì)于下降沿是指比較低電壓。下沖是指下一個(gè)谷值或峰值超過(guò)設(shè)定電壓。 </p> <p> <br /> 仁遠(yuǎn)電子，專業(yè)從事PCB設(shè)計(jì)，pcb線路板生產(chǎn)服務(wù)商，價(jià)格便宜，點(diǎn)此查看！</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="河南安防PCB設(shè)計(jì)制板,PCB設(shè)計(jì)" src="https://tyunfile.71360.com/UploadFile/dgrydzkj/637366417229892578/321962.png"></div><p> PCB設(shè)計(jì)的原件封裝：（1）焊盤(pán)間距。如果是新的器件，要自己畫(huà)元件封裝，保證間距合適。焊盤(pán)間距直接影響到元件的焊接。 </p> <p> （2）過(guò)孔大?。ㄈ绻校?duì)于插件式器件，過(guò)孔大小應(yīng)該保留足夠的余量，一般保留不小于0.2mm比較合適。 </p> <p> （3）輪廓絲印。器件的輪廓絲印比較好比實(shí)際大小要大一點(diǎn)，保證器件可以順利安裝。 </p> <p> <br /> </p> <p> PCB設(shè)計(jì)的布局（1）IC不宜靠近板邊。 </p> <p> （2）同一模塊電路的器件應(yīng)靠近擺放。比如去耦電容應(yīng)該靠近IC的電源腳，組成同一個(gè)功能電路的器件應(yīng)優(yōu)先擺放在同一個(gè)區(qū)域，層次分明，保證功能的實(shí)現(xiàn)。 </p> <p> （3）根據(jù)實(shí)際安裝來(lái)安排插座位置。插座都是通過(guò)引線連接到其他模塊的，根據(jù)實(shí)際結(jié)構(gòu)，為了安裝方便，一般采用就近原則安排插座位置，而且一般靠近板邊。 </p> <p> （4）注意插座方向。插座都是有方向的，方向反了，線材就要重新定做。對(duì)于平插的插座，插口方向應(yīng)朝向板外。 </p> <p> （5）Keep Out區(qū)域不能有器件。 </p> <p> （6）干擾源要遠(yuǎn)離敏感電路。高速信號(hào)、高速時(shí)鐘或者大電流開(kāi)關(guān)信號(hào)都屬于干擾源，應(yīng)遠(yuǎn)離敏感電路（如復(fù)位電路、模擬電路）。可以用鋪地來(lái)隔開(kāi)它們。 </p> <p> <br /> ***線路板、 pcb設(shè)計(jì)，專業(yè)生產(chǎn)，快速出樣，這里的價(jià)格更實(shí)惠！河南安防PCB設(shè)計(jì)制板</p><p style="text-indent:25px">本公司是專業(yè)提供PCB設(shè)計(jì)與生產(chǎn)線路板生產(chǎn)廠家，多年行業(yè)經(jīng)驗(yàn)，類型齊全！歡迎咨詢！河南安防PCB設(shè)計(jì)制板</p><p>電磁感應(yīng)自然環(huán)境的干擾和系統(tǒng)軟件內(nèi)部的互相竄擾，比較嚴(yán)重地威協(xié)著電子計(jì)算機(jī)和數(shù)據(jù)系統(tǒng)軟件工作中的可靠性、可信性和安全系數(shù)。在家中、商業(yè)服務(wù)、加工廠和代步工具中微控制器應(yīng)用的水平在持續(xù)增加。未來(lái)，在多種多樣電子器件設(shè)備屋子里會(huì)出現(xiàn)大量的發(fā)送和比較敏感設(shè)備，相對(duì)的難題也就接踵而來(lái)。如今，伴隨著無(wú)線通信技術(shù)的出現(xiàn)。在基本上全部的電子器件設(shè)備上都很有可能出現(xiàn)這類新的發(fā)射裝置。手機(jī)藍(lán)牙是一種應(yīng)用ISM（工業(yè)生產(chǎn)、科學(xué)研究和藥業(yè)設(shè)備）頻率段，在范疇大概為30m內(nèi)的電子器件設(shè)備間全自動(dòng)開(kāi)展通訊的無(wú)線網(wǎng)絡(luò)跳頻技術(shù)標(biāo)準(zhǔn)。全球范疇內(nèi)超出1200家企業(yè)早已接納了手機(jī)藍(lán)牙的操作規(guī)范。到04年，將有4億臺(tái)設(shè)備應(yīng)用手機(jī)藍(lán)牙。顯而易見(jiàn)，當(dāng)曝露在出射網(wǎng)絡(luò)信號(hào)下時(shí)，選用無(wú)線通信技術(shù)的設(shè)備應(yīng)當(dāng)能夠一切正常工作中。但我們不可以明確的是，鄰近的別的非手機(jī)藍(lán)牙設(shè)計(jì)方案的設(shè)備可否不會(huì)受到干擾地工作中。信息科技設(shè)備的電磁感應(yīng)泄露威協(xié)著網(wǎng)絡(luò)信息安全。在互聯(lián)網(wǎng)時(shí)代，信息內(nèi)容泄露被覺(jué)得是對(duì)網(wǎng)絡(luò)信息安全的較大威協(xié)。可是，電子計(jì)算機(jī)的電腦鍵盤(pán)、顯示器等都是會(huì)使信息內(nèi)容根據(jù)輻射源泄露出來(lái)。這就是說(shuō)白了的TEMPEST狀況。河南安防PCB設(shè)計(jì)制板</p><p style="text-indent:25px">東莞市仁遠(yuǎn)電子科技有限公司是一家電子產(chǎn)品軟硬件開(kāi)發(fā)，PCB Layout PCB 24小時(shí)快速打樣，中小批量PCB生產(chǎn)（FR-1 22F CEM-1 FR-4 銅基鋁基 FPC Tg280材料及高頻板）中小批量，樣品SMT快速代工代料服務(wù) 。的公司，是一家集研發(fā)、設(shè)計(jì)、生產(chǎn)和銷售為一體的專業(yè)化公司。公司自創(chuàng)立以來(lái)，投身于電子產(chǎn)品研發(fā)，PCB 設(shè)計(jì)，中小批量PCB生銷售，SMT代工代料，是電子元器件的主力軍。仁遠(yuǎn)電子科技致力于把技術(shù)上的創(chuàng)新展現(xiàn)成對(duì)用戶產(chǎn)品上的貼心，為用戶帶來(lái)良好體驗(yàn)。仁遠(yuǎn)電子科技始終關(guān)注電子元器件行業(yè)。滿足市場(chǎng)需求，提高產(chǎn)品價(jià)值，是我們前行的力量。</p></p><br /><p>文章來(lái)源地址: http://www.cdcfah.com/cp/3057787.html</p></div></div></div></div></div><div id="n29olkw" class="page-right twoColRt"><div id="fegyqse" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="v3yl3u4" class="recomPic likePro"><a href="http://www.cdcfah.com/cp/814588.html"><div><img src="http://tyunfile.71360.com/UpLoadFile/2019/11/1/14/637082168864691056_lgpj_5374157.jpg" alt="福建ZF配件哪家強(qiáng) 信息推薦自業(yè)物資供應(yīng)" class="vcenter" 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